Controle de Percevejos com inseticidas visando qualidade de sementes de soja

Abstract

The quality of soybean seeds is a function of the physical, genetic, health and physiological. Among the physiological attributes the force is configured as a preponderant factor for obtaining high yields. However it may be severely reduced when there is pest attack, especially the bedbugs phytophagous. The indiscriminate use of insecticides and the abandonment of the integrated management has contributed to the high infestation of these insects in production areas of soybean seeds. The possible loss of efficiency of plant protection products as a result of selection of resistant populations, and the lack of new alternatives has caused concern among producers of seeds. Thus, this study aimed to evaluate the control of bedbugs insando the quality of soybean seeds. The experiment was conducted during the season 2015/16 on the property called Fazenda Sapucaí, municipality of Tasso Fragoso-MA. The experimental design was in randomized blocks with four replications. We used seven treatments with insecticides recommended for control of stink bugs in soybeans. The spraying was performed in R3 and R5.1. The results were submitted to analysis of variance, and when significant were evaluated by the test of Duncam. All products evaluated were effective in controlling bedbugs adults (above 70%) until the seven days after spraying in R3 and R5.1 the period of 7 to 15 days after spraying showed high populations of neotropical and possible reduction of residual. The treatments T4 (Thiametoxan + lambdacyhalothrin) and T7 (Imidacloprido + gamma-cyhalothrin) had control percentage of more than 70% up to 10 days after the second spraying. The damage of neotropical significantly higher in the control treatment, however there was no difference between the treatments. The damage of neotropical was greater than 6% influencing negatively the seed vigor. There was no significant difference for the variables income and thousand seed weight.